greencard

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A permanent resident is someone who has been granted authorization to live and work in the United States on a permanent basis. As proof of that status, a person is granted a permanent resident card, commonly called a “green card.”
You can become a permanent resident several different ways, such as being sponsored by a family member or employer in the United States. The steps to getting a green card vary depending on which category you fall under.
Learn more about the options and steps to becoming a permanent resident.

http://www.uscis.gov/greencard